Correct Answer: D. (ii) and (iii) only

Explanation

The S.I unit of heat capacity is JK-1 and it is an extensive property as it depends on the amount of substance present.

Therefore, (i) and (iv) only arenot true

Correct Answer: D. the smallest temperature change that can be detected or measured

Explanation

The sensitivity of a thermometer is defined as the smallest temperature change that can be detected or measured, NOT how quickly that temperature change can be detected. In contrast, the difference between the maximum and the minimum temperature is the range of a thermometer

Correct Answer: C. Huygen

Explanation

The pinhole camera works on the principle of the rectilinear propagation of light. This principle states that light travels in straight lines. When light passes through the tiny hole in a pinhole camera, it forms an inverted image on the opposite side of the camera. The size of the image depends on the distance between the object and the pinhole.

Correct Answer: D. 56.6 g

Explanation

Let mb=mass of empty bottle,

\(m_w\)=mass of water only and

\(m_a\)= mass of alcohol only

given; \(m_b\)=19g

\(m_b\) + \(m_w\) = 66g

\(m_b\) + \(m_a\) = ?

R.d=0.8

R.d=mass of alcohol

⇒\(\frac{mass of alcohol}{mass of equal volume of water}\)

⇒ mass of equal volume of water = \(m_w\)=66-19=47g

⇒0.8 = \(\frac{m_a}{47}\)

⇒\(m_a\)=0.8×47 =37.6g

; \(m_b\) + \(m_a\) = 19+37.6=56.6g

Correct Answer: A. 422.7

Explanation

h=32·8m, p= \(1×10^3kgm^-3\)

g=9·8 \(ms^-2\) , \(P_a\)=101·3KPa

\(P_T\)= ?

P=hpg

⇒\(32·8×1×10^3 × 9·8\)=321440 \(P_a\)

⇒321·44KPa

⇒ \(P_T\) =321.44+101.3

;\(P_T\)=422·7KPa

Correct Answer: D. 500

Explanation

Ep = 2.2kV = 2200V; Es=110V; Ns=25; Np=?

=\(\frac{E_p}{E_s}\) = \(\frac{N_p}{N_s}\)

= \(\frac{2200}{110}\) = \(\frac{N_p}{25}\)

=110 × Np = 2200 × 25

=\(N_p\) = \(\frac{55,000}{110}\)

∴\(N_p\) = 500 turns

Correct Answer: C. north and north

Explanation

The polarities at X and Y would be north and north.

Correct Answer: B. (i), (ii) and (iv) only

Correct Answer: A. 800 Hz

Explanation

T=800N; I=50cm=0.5m,

m=10g=0.01kg

fundamental freq: \(f_o\) =?

\(f_o\) = \(\frac{1}{21}√{T}{μ}\)

μ =\(\frac{m}{1}\)=\(\frac{0.01}{0.5}\)

⇒ \(f_o\) =\(\frac{1}{2×0.5}\)√\(\frac{800}{0.02}\)

\(f_o\) ⇒√ 40,000

⇒1st overtone = 2\(f_o\) =2×200 = 400Hz

⇒2nd overtone =3\(f_o\) =3×200=600Hz

∴3rd over tone= 4\(f_o\) =4×200=800Hz

Correct Answer: C. Rubber

Explanation

Rubber is a good insulator because it does not allow electrons to flow through it easily. Copper, silver, and water are all good conductors of electricity.